kefir/src/one-source/sliding-window.js

Reactive Programming library for JavaScript inspired by Bacon.js and RxJS with focus on high performance and low memory usage

import {createStream, createProperty} from '../patterns/one-source'
import {slide} from '../utils/collections'

const mixin = {
  _init({min, max}) {
    this._max = max
    this._min = min
    this._buff = []
  },

  _free() {
    this._buff = null
  },

  _handleValue(x) {
    this._buff = slide(this._buff, x, this._max)
    if (this._buff.length >= this._min) {
      this._emitValue(this._buff)
    }
  },
}

const S = createStream('slidingWindow', mixin)
const P = createProperty('slidingWindow', mixin)

export default function slidingWindow(obs, max, min = 0) {
  return new (obs._ofSameType(S, P))(obs, {min, max})
}